Community Structure and Post-monsoonal Distribution of Icthyoplankton in Kuatan River, Malaysia

John, Akbar; Hassan, Boru A; Hanisa, S. Nur; Kamaruzzaman, M.; Sha, Bo

doi:10.26480/ees.01.2017.01.03

Cited by 3 publications

(2 citation statements)

References 9 publications

(11 reference statements)

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“…The conical section is the main separation area in a hydrocyclone and whether its structure is reasonable is crucial to the improvement of separation efficiency (Zhang et al 2011, Tang et al 2015, John et al 2017. According to previous studies, the analytical solution of axial velocity inside the hydrocyclone is:…”

Section: Structure Of the Parabolic Hydrocyclonementioning

confidence: 99%

Heavy Metal Removal From Dredging Slurry Using a Parabolic Hydrocyclone

Yang

Liu

Zhang

et al. 2019

Rev. Int. Contam. Ambie.

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Heavy metals usually aggregate as fine particles in dredging slurry and need to be removed or reduced before recycling of the slurry. However, traditional hydrocyclone method often leads to low separation efficiency because of the difficulties in the complete separation of fine particles. To address this problem, this paper proposes a new type of parabolic hydrocyclone for the removal of heavy metals from dredging slurry. The computational fluid dynamics (CFD) software together with mixture and Reynolds stress model (RSM) have been used to simulate the internal flow field of the parabolic hydrocyclone, which was then verified with experimental tests. The simulation results show that, compared with traditional hydrocyclones, the flow field inside the parabolic hydrocyclone is more stable, which effectively help to avoid the mixture of coarse and fine particles caused by the flow field disturbance. Further experimental results demonstrate that the cumulative percentage of fine particles in the underflow product decreases. The cut size increases from 30 μm to 49 μm and the steepness index rises from 0.13 to 0.2, which proves that the separation accuracy can be improved, and the fine particles mixed in the underflow can be removed effectively. Moreover, the recovery rate of heavy metalas Zn and Cr in the overflow products reaches 97.21 % and 78.27 %, respectively, verifying the enrichment effect. Therefore, after the parabolic hydrocyclone separation process, the underflow products contain less heavy metals and become both non-hazardous and recyclable. Palabras clave: metales pesados, hidrociclón parabólico, CFD, eficiencia de separación, tamaño de corte RESUMEN Los metales pesados usualmente se agrupan como partículas finas en los lodos dragados y necesitan ser removidas o reducidas antes de reciclar el lodo. Sin embargo, el método tradicional del hidrociclón con frecuencia lleva una eficiencia de separación baja debido a las dificultades para lograr la separación de las partículas finas. Para resolver este problema, este artículo propone un nuevo tipo de hidrociclón parabólico para remover metales pesados durante el dragado de los lodos finos. Para simular el campo del flujo interno del hidrociclón parabólico, que después fue verificado con pruebas experimentales, se utilizaron la dinámica de fluídos computacional (CFD, por sus siglas en inglés) junto con el modelo de mezcla y el modelo de estrés de Reynolds (RSM). Los resultados

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Section: Structure Of the Parabolic Hydrocyclonementioning

confidence: 99%

Heavy Metal Removal From Dredging Slurry Using a Parabolic Hydrocyclone

Yang

Liu

Zhang

et al. 2019

Rev. Int. Contam. Ambie.

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“…In principle, the sandy gravel and rocks does not need classification, but screening tests are first done to natural materials in the mix ratio design and the coarsest gradation, the finest gradation and average gradation of aggregate are distinguished (Feng et al 2013;John et al 2017). The sand rate range should be controlled at 25%-30%.…”

Section: Design Methods Of Csgr MIX Ratiomentioning

confidence: 99%

Shear Strength of Cemented Sand Gravel and Rock Materials

Liu¹,

Jia²,

Wu³

et al. 2017

JSM

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Constituent diversity of ethanol extracts from pitaya

Zhang

et al. 2020

Asia-Pacific J Chem Eng

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Pitaya is rich in nutrition and unique in function and contains vegetable albumin, anthocyanins, rich vitamins, and water soluble dietary fiber, which are rare in fruits and vegetables. However, researches mostly focused on pitaya cultivation, biological characteristics, fresh‐keeping, and lacked analyses about chemical composition of pitaya. Therefore, ethanol extraction and GC/MS were used to extract and identify the bioactive components in pulp and pericarp of red pitaya and white pitaya. The extracting results showed that percentages of ethanol extracts from pulp and pericarp of red pitaya were 14.5% and 12%, whereas those of white pitaya were 16% and 12%. The GC/MS results showed that different kinds of bioactive constituents were identified in fresh pericarp and pulp of red pitaya and white pitaya. In the four ethanol extracts, there are rich polysiloxane plant organosilicon with total contents of 10.09%, 24.21%, 25.77%, and 23.25%. Meanwhile, there are many heterocyclic substances, and the content of pericarp is much higher than that of pulp. The four ethanol extracts also contain some other bioactive ingredients, such as esters, hydrocarbons, alcohols, amides, halides, and fatty acids, which can be used as raw materials for biomedicine, advanced cosmetics, and skin care products.

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Community Structure and Post-monsoonal Distribution of Icthyoplankton in Kuatan River, Malaysia

Cited by 3 publications

References 9 publications

Heavy Metal Removal From Dredging Slurry Using a Parabolic Hydrocyclone

Heavy Metal Removal From Dredging Slurry Using a Parabolic Hydrocyclone

Shear Strength of Cemented Sand Gravel and Rock Materials

Constituent diversity of ethanol extracts from pitaya

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